Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
Which of the following tissue is formed through dedifferentiation?
1. Phellem
2. Phellogen
3. Phelloderm
4. Protoderm
Answer:(2)
Phellogen – Secondary meristem also known as cork cambium
👉The cells derived from root apical and shoot-apical meristems and
cambium differentiate and mature to perform specific functions. This act
leading to maturation is termed as differentiation.
👉For example, to form a tracheary element, the cells would
lose their protoplasm. They also develop a very strong, elastic,
lignocellulosic secondary cell walls, to carry water to long distances even
under extreme tension.
👉Plants show another interesting phenomenon. The living differentiated
cells, that by now have lost the capacity to divide can regain the capacity
of division under certain conditions. This phenomenon is termed as
dedifferentiation
👉For example, formation of meristems – interfascicular
cambium and cork cambium from fully differentiated parenchyma cells.
👉While doing so, such meristems/tissues are able to divide and produce
cells that once again lose the capacity to divide but mature to perform
specific functions, i.e., get redifferentiated
👉Example: redifferentiation in plants are secondary xylem, secondary phloem, secondary cortex (phelloderm) and cork (phellem).
👉Growth in plants
is open, i.e., it can be indeterminate or determinate.
👉Even differentiation in plants is open
👉Define growth, differentiation, development, dedifferentiation, redifferentiation,determinate growth, meristem and growth rate.
